Hot Deformation Behavior and Hot Processing Map of Mo-14Re Alloy
The constant strain rate compression experiments were conducted on Mo-14Re alloy by the Gleeble-3500 thermal simulation testing machine.The rheological behavior of Mo-14Re alloy at 1400,1500 and 1600 ℃,and strain rate of 0.01,0.1,1 and 10 s-1 was studied.The results show that during the hot deformation process,the flow stress decreases with the increase in deformation temperature and the decrease in strain rate,which is due to the relative effect of work hardening and dynamic softening under different conditions.Based on the Arrhenius model and Zener-Hollomon function,a constitutive equation of the flow stress of Mo-14Re alloy is established,and the activation energy for hot deformation of Mo-14Re alloy is obtained to be 588 310 J·mol-1.According to the established hot processing map,the reasonable forming process parameters of Mo-14Re alloy are as follows:temperature is 1400-1600 ℃,the strain rate is 0.0089-0.14 s-1,and the power dissipation coefficient η is not less than 0.22.
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